Question

6. Se da numarul intreg a=2^1990-2^1989-2^1988 Sa se afle x din proportia:
a/x=4^9993/25


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Answer 1

a= 2^1988(2^2 - 2^1 - 1) = 2^1988(4-2-1) = 2^1988×1 = 2^1988

a/x = 4^9993/25

2^1988/x = (2^2)^9993/25

2^1988/x = 2^19986/25

x = (2^1988 × 25) /2^19986

x= 25/2^17998